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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c34c9b6c2acfd1962ff5eb5a930e6e8c659acaf7000089e47826a8d21ed745' 
  AND token = 'Om5Glv2bcI8RbwOGwALeFMaNF9FfiORATVZ/4LpeG/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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