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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fddd8d682e21179d577bd6a7b4948c689d7bbe5dcdfe57eeaca32c2dfeb0715' 
  AND token = 'q/2p3uZVYRe95LKR6HoYWbZtJNXGx0OkuSRCbeqEXnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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