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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2ae05b1ca4406a0ff2599ccda95e909e86e4752a70830f2b5992504e658830' 
  AND token = '0M67Jkln5MMRgX3L/VdKN8AtLzyDAMdWpV8jBCWTF0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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