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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48ec83fa65875e9c18a773a7f8b0be05f298f68e603b8cf06f1c54124957170' 
  AND token = 'jT68ohe4a3WGQSC8k4uvfF63huDwtW0X4//o3x/SqfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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