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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d17b64f555e9c084f8dffffa35b3d8fd82c9f53d753b001a7f171e663c4e4ef' 
  AND token = '6miRs81X0VdVowArAzui0PVKjbjNOMW1hovm/Ott4cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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