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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fda403047e0b1be1065404bb5e125ffa1308ff519d77a348b1e70757f61daa2' 
  AND token = 'vAD8gfumI11/VE2mogeSiFbRWplNzdEm6q7CaBBfhVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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