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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96740e3f9c4c156ae43898cb4bf60b14d7f9057cb09fa0d6e55ac6f0d02f2988' 
  AND token = 'pS4NYLBlqRT32N7E3eSbwzh/qmNe9UwpCiOAWM3//08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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