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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2562bc22a92fea569b3b5825cd66cfadbf9857529d76ae5535ee7898f6c97a' 
  AND token = '+PV7CFXGxGVWoQ2cgcF5yizJnzkgVxL21BG1FHBsCVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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