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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0c5ffc77938ba94a3930df24b6bb2bb0e91b6031d98b1d756ad9e07a63fea3' 
  AND token = 'ggy9nOdpocrxkc4yG7Ds2v1kiHZ3MsdcFIHlUvjxdoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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