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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710e4aa9440d12ca6294dcbe8e3c6a30dacfc1918b5ec680324e6bf80cf2b11a' 
  AND token = 'OwfB4mQ6JuRqY24fiWz8Bx/nTEg3iSJ7WTPzVohodkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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