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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4b79b36681b6c4354a4843cffe49322ad4515754b3b3b9107b84ca66516e7b' 
  AND token = 'wAL529D5dDOf5HhlY915MYGFep2TIhW2nZsj75cMjeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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