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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665b377546cc65745ac631bed7e115c3868591f0afba90c1b9a32a7524767802' 
  AND token = 'yQpW9uFsw9JxOEYfZIJciCHByutcg0oMFGt3NTXJV5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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