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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad3bf872b4d85a04455b10d3c4ebd7a757be9c1ca6715b2d9eb57971f6fe785' 
  AND token = 'TjyPhQ0+KWJHNTyFVI3TiSyyRXnhl8QIAMXC/Fes9vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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