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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf07857d27d19ee40b6e57c72c69802ef932e07a3e9aedea9c1f9b6ec268755' 
  AND token = 'DZwnSsqq70oejlyfbc42UafLltyem4O9GCJLDDBHpU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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