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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '496b558b686c9e038c64bfb2b2eae754091dc6ccdf4bceff2b4eb201088deaaf' 
  AND token = 'X9mHb8zFchDyWWlh+f00tvZvd/xwG/LPx+U6tKR2rFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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