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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f15b6dfc2be88a41067db816a70f37dee01ca3cd381fd126495bfa0ffff25e6' 
  AND token = 'VLlkNYWvzaWx/Ia3B1328XE6kC/nQJsMdCco+gBnVjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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