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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215fb5eeaa4cbc80f105f22ff5020ce5ad90f4630cf2c331d4f1f040565fe1d2' 
  AND token = 'ExOF6bV8r3ZiVHyilseTT0RE/vLmR7jfuZHl7NV81NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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