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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5296151ffeba9d4070b8f73e89492211defc6918dd62199f5c5ba6ba1c5071' 
  AND token = 't69qAg06SB92Z4jcwDhlnWRRkYydo1GgVUhZDWq8D7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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