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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb44301a5424d7130bb745564351dece2b58ea7ffece0a7dd84298aa24b9b00' 
  AND token = 'w1W89BvOD7mSGDMY5z56onnN/If06JCmrtTIeZSs0ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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