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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b07afc0f0834183a2331d488084638660169a1fc2c7d6e4b6ad3aae323e7355' 
  AND token = 'kLoyioC3uSnVJtBs9FA5Ww6ciDpHG5bh93fa3/lTxPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}