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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73a73c66bae9df0b388115a906fc930ca4ee092d19d0e9c8d1a6850568196df' 
  AND token = '2NSG5OzG31klgsK7vEVpjiPtuiP6h3o7C7Mcy1Rpvrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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