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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19201062a5d14a9f8e4a011e7e1f54ff942688e2844eb62358c05120223ef8ab' 
  AND token = 'jaI1OQ8A4pkuMiGYJmC9OEsWqYK4m0tMUYaCA5/ZpCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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