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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b7878718b7b8a8f8f31d3eb2e8dcbc17bccd2b69893c9c25124a643e58c914b' 
  AND token = 'ki30g7oiny0p+0x0tJgzhioxUhKzDAg0t/5yyP1H39I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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