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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64d2f05bbff74c83152bc2403367cdd2589c7ee9d946c115763346ad7b0d852' 
  AND token = '9xH8tdwl4WLWqBVL860yrTCZGyww2kjvyHBYn8dWkB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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