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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c348452cf84c8ce36c09dc23c8ba009e64d939c6dfa114aa7f98b95e247f8b83' 
  AND token = '9zn6HDUo8/sVTx54q8KxGI2soOcYw6sd9ihdDsBeSOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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