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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d5a7ddf822bc3d92e48e92b78f14d1385369f773ec2a83535e72e30edca957' 
  AND token = 'aHVn7cVfJ6sSwpH/RhoPHTjdDGRkhO4egp3xy66jbWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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