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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34038a7b3156a93e541c47b06c8cfbb47c078f795d6949c21fcc71b0ec4bb462' 
  AND token = 'l3575GLjTxsa/6kifDy6wS9WRNKMUQz4dYMkEc4kjgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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