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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e7a1782ca3d730d8f58f7e817472a480918f85b3e586cd4f0dc9d6e80e586f' 
  AND token = 'J/LOraSCZ6quSIjARURJ68Ra2PydgJVR8ZNnBQi6CcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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