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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7721f91e75a2ea06ee2e921fdc4314d725efce7e5cbd1584b7695f769a6b393c' 
  AND token = 'nYZt7r/xewJ/uk4aPMXHphIWp25P1V5+gj2Q6p4y0Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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