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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f56c56c46f400c4b80f1ac6efb38b3b7d4d064ba986c3ef66be6b8aaefbd08' 
  AND token = 'OJwrfxWH/yC32WnZ9EsNA5KjDYM8dzfoYnwAJuPngOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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