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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0b4716e8c517c8d39dad9e9119c51ee9b4650b9cbafe6d870f28d04bc5be62' 
  AND token = '9UvIfPPU6ukOOhTn/SpxTpm/nLt2s+im0YIyjtCl9Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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