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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb61b0704a3224ac34252a5f764ead8019807690c2557ddf8b5dc0bd4acbe09' 
  AND token = 'puZEtOcY9i0OAaiDLmUEtAan3CvXoRPIQjSKHGjn2HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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