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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f403fa76d2a3e5ec67c46047175c7a13f44865ee10731f1ad1b3370e78dc0f1a' 
  AND token = 'SHU3XK8HZQ/2jBB6Vpc6aAKPcxU99Owt1VfxWC5x/zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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