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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea008c3bc15f6dddeeec337c3bfe159c390ff9b482d90ff4a5cc1a0ac3953dc' 
  AND token = 'jim5J5la1Dodvcko+hURs46BZ0PwnFAO7ugGeweBJdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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