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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a067c26acbfc94e8b08e939d0910b27c434c433cb65b71af107eeb95a04875' 
  AND token = 'GgivufMzaYx6zfPqiBlBD51K4Qo/EhoLMp3QykG3a8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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