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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a844414ac038160f820ca4d32753336be9ef12fa4c5d8cc8572079f9a501a7d' 
  AND token = '268UjGlfUQ3G/BiM76reVS0+eCUho8EDJIUhvJF9/NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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