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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec9debe099e3cccc0b2e29926354174913eb53591658150988691df3e307c8d' 
  AND token = 'feJZZDtfAecTHXUgckNDh3mkPS5r6We3MN6aPgSTGkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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