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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd909abd8ecfa5ebc9a4392ea492a75d4171044cb375d3508c982813f66d573df' 
  AND token = 'vFboJQhBSOf8yuE493y1Y9bCm40rhr3GlHZJSBxGwds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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