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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2a96d9d82be9a444c37c5247668ca665444d1b0066fd472e1c9a48e548ae1b' 
  AND token = 'Lh8gsCFs4sRthejzKcnOGrVEvFn+Kh1hw69+NayFC0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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