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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1357c08f7ca3f5df95d7335711e20f14c1b6a7bbfd51dac253ae8599063ecbd5' 
  AND token = '0U2D3mlxnp4h5aFSh8nrjp188qPr4DslfU+wV0Vn5yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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