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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa96cb5628235a4845ab1e45a16ec9db3363b3ff736b404e484aa7335b29b9a' 
  AND token = '40zKi7Yi+B/BoYyftLuCOAI12wdc+f+SZG+N1r0Fiw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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