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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02c64b435ebb1c86f49a83e112a5850dd073627be2a2cdc6070217103e24887' 
  AND token = 'MtI3Snb2pevzAYmUvWULbsGPvF4MLMjM3+RntoStTm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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