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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1f13027d288796e20f7f15503953a133ce6c16568188fb62f07e420847e8f3' 
  AND token = '30ocWVrBkeFPmSDSKRJmUCBfJIl3r+LwtaSG7adPbiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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