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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12be9d26d20ce6ae8d08092457774fd2192be0fb3fae664144c72112c13e9710' 
  AND token = 'Wtz3DKaMDlCLNA6BPGX5/GnEX8DUC3NOo57fgIfnTEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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