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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7073f03288887773f9a25cb8aafa9ffaac79a66e6eb67411a27350315b12bf' 
  AND token = 'utLK5B/39F6ouMGwvRaYueyY/QGv+A0g+RdEIOOeQmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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