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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9248885270e5287dccbdae16ca967782c3cf01a0db6bda6f91673260221d5cf3' 
  AND token = 'f2FVfV51ZD8evh611lhJjp14ABdtC5XKSXMwEdMHfAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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