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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02007e92b7e291c25c42d450a788c27367bc594dcfbaed8e9271d6b169fa9b42' 
  AND token = 'KIbFgfEssTVvhWK/qzmdfcQ06ce6rTwN1TyCSsjGj8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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