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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1761bcc6467cf8582168994052a38dac999a8d92e358b10ebf5403b6a0f475' 
  AND token = '3gssR6BTk1MhPioZqhAvY9WJ3fu10xSEl1CT2IjOqsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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