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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69af1210d3826d7fe1147ae7e4c4e1e0b37886d8b1ddf2c03e3ce3a4751e2c6' 
  AND token = 'P5HelDRWQXesFJmQlVCs6FD7zSUyt9brdNn1VLfcBIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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