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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d148ef29677e586718df3fc705ff57878554c6e852dd38ee68f4ea611d05b6' 
  AND token = '9nQtBgcPN0Wa7K0U5b6o3g6wOrG+qykwCjkwqjyRQ9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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