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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff284c5dad69fd73c1e0431b3aed178b200fe245d1c27f85fd4bf2ccd406700' 
  AND token = 'I4QBdd0/3t3dNy1O3UVeksK3vHJ7Bm9FvzZ8Fg+a18I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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