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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d1efd977969e36f8616e0d751e9a39761f6eacc0caad9d4e33fcf0eef576c5' 
  AND token = '6yWyFhloKCne3c7g0NVSkHlYfpZr+nbCnhuzNS1b2wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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