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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20bfe8a89cb3bb1440a3b12026a6de43357e3300de6cdfdec71619cb4c707d20' 
  AND token = 'cfLeL3dKWJRhcvklq8Sk1nA9tZ/akjVHqMs1BLzK++w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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