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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c62d95fbc8b4eae22a275e4b76be4bbd969c174ea8bb40dcf096db19a23752e' 
  AND token = 'rfuDRiP521tXEEh1n1bD3KEjKG0iQ4e8mzW9+aNm6+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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