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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b827c4e15ec0a448309ae8271b3aa0c5069e3073205ee0255f33b7bee6cde2a6' 
  AND token = 'cC7fU7N/auenzR1+12SMikfKm7Zhmg4/aukKmnFa8p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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