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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a079a92e06b1d8e18f37fe92d08db47d76dedc2af8712668bc0f85ec8875198' 
  AND token = 'mNjoQ8gaJ2fZ42swYHENoNza3yTOdgssUAB+Io0A5uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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