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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc198c84c78f6ac3f11ab82c7cf3a01a6fb8de9cf5055aab18fcd18906656e3' 
  AND token = '7nexQ+TzaOfa36XKWPlNu5nWGbSurNzjl2+I1iknz2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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