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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d28674a6f05d41c7078d05f7cc21c26c5eaf4ce66b9a679e644604aa212f551' 
  AND token = '700bg/JO980pCHm6s0+SJ1o0aZ7V/QCc1TXPE7BC3bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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