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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c829a2d63f166a51257c95ac62188d26ae7a73a0f61aa43b20b5d3f8e5773ecc' 
  AND token = 'jwa86gEdGAUwHWOFWwG4nrPCfgvldS6Lc9oPr560HNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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